/Engine/Plugins/Experimental/Water/Source/Runtime/Public/WaterQuadTree.h
Add an automatically generated mesh (8 quads) skirt around the main water quadtree which extends out InFarDistanceMeshExtent, is placed at Z value InFarDistanceMeshHeight and is rendered using InFarMeshMaterial
void AddFarMesh ( const [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * InFarMeshMaterial, double InFarDistanceMeshExtent, double InFarDistanceMeshHeight )